2. Multiply each bit by its corresponding power of 2 and add all the terms up.
1101 1110 1100 1010 1101 0011(2) =
(1 × 223 + 1 × 222 + 0 × 221 + 1 × 220 + 1 × 219 + 1 × 218 + 1 × 217 + 0 × 216 + 1 × 215 + 1 × 214 + 0 × 213 + 0 × 212 + 1 × 211 + 0 × 210 + 1 × 29 + 0 × 28 + 1 × 27 + 1 × 26 + 0 × 25 + 1 × 24 + 0 × 23 + 0 × 22 + 1 × 21 + 1 × 20)(10) =
(8 388 608 + 4 194 304 + 0 + 1 048 576 + 524 288 + 262 144 + 131 072 + 0 + 32 768 + 16 384 + 0 + 0 + 2 048 + 0 + 512 + 0 + 128 + 64 + 0 + 16 + 0 + 0 + 2 + 1)(10) =
(8 388 608 + 4 194 304 + 1 048 576 + 524 288 + 262 144 + 131 072 + 32 768 + 16 384 + 2 048 + 512 + 128 + 64 + 16 + 2 + 1)(10) =
14 600 915(10)
The number 1101 1110 1100 1010 1101 0011(2) converted from an unsigned binary (in base 2) and written as a positive integer (with no sign) in decimal system (in base ten):
1101 1110 1100 1010 1101 0011(2) = 14 600 915(10)
Spaces were used to group digits: for binary, by 4, for decimal, by 3.